Study on the Optimization of Coal Pillar Width in Goaf-Side Roadway Under the Synergistic Effect of Mining and Seepage
Source abstract
Abstract
In coal mine roadways excavated along the goaf with water accumulation, the roadway is subjected to the combined effects of water infiltration and multiple stresses from excavation activities, leading to significant deformation and challenges in determining the appropriate coal pillar width. This study, based on the Jianxin Coal Mine 4301 tailgate, utilizes the advanced three-dimensional numerical calculation software FLAC3D 6.0 to develop a comprehensive seepage flow model. By analyzing the distribution of key roadway surrounding rock properties, such as deviatoric stress, plastic zone, and dissipated energy, the influence of coal pillar width on roadway deformation and failure characteristics is systematically investigated. The findings provide novel insights into the roadway stability control under complex geological conditions. Specifically, the results reveal that: (1) When the coal pillar width is less than 9 m, stress concentration zones are observed, fully connected by plastic zones and dissipated energy. For widths exceeding 9 m, the influence of the goaf diminishes, leading to a stress reduction zone within the coal pillar and a shift in dissipated energy density distribution from a penetrating shape to an independent double-core shape. The plastic zones on both the goaf and roadway sides become independent, indicating a transition from an unstable to a stable coal pillar state. (2) Using the Analytic Hierarchy Process (AHP), a zoning control system for the roadway surrounding rock is established, dividing the roadway into three regions: normal support, reinforced support, and special support. Industrial experiments corroborate the simulation results, and on-site monitoring demonstrates that the control measures significantly improve roadway stability. This study presents an innovative approach to the design and control of coal pillars in water-affected mine roadways, offering valuable contributions to both the scientific understanding and practical application of mining engineering in similar geological settings.
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Research context
OpenAlex topics: Geomechanics and Mining Engineering · Geoscience and Mining Technology · Grouting, Rheology, and Soil Mechanics
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Affiliations
School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Taiyuan Coal Gasification (Group) Corporation Limited, Taiyuan 030031, China
Qipanjing Coal Mine, Guoneng Mengxi Coal Chemical Co., Ltd., Ordos 017000, China
Funding
National Natural Science Foundation of China · Ordos Science and Technology Plan Project
References (38)
Show source-provided references
1. Ground subsidence evolution from 1000 m deep mining: A case study in fengfeng mining area10.1155/2021/9942968 ↗
2. Rock dynamics in deep mining10.1016/j.ijmst.2023.07.006 ↗
3. Study on the Mechanism of Progressive Instability of Special-Shaped Coal Pillar and the Stability Control of Roadway Under the Influence of Mining10.1007/s00603-024-03798-6 ↗
4. Borehole transient electromagnetic response calculation and experimental study in coal mine tunnels10.1088/1361-6501/ad1db2 ↗
5. Advanced detection methods for tunnels and roadways: A review10.1088/1361-6501/ad98b2 ↗
6. Wu, W., Wang, T., Bai, J., Liu, J., Wang, X., Xu, H., and Feng, G. (2024). Failure Characteristics and Cooperative Control Strategies for Gob-Side Entry Driving near an Advancing Working Face: A Case Study. Processes, 12.10.3390/pr12071398 ↗
7. Innovation and future of mining rock mechanics10.1016/j.jrmge.2020.11.005 ↗
8. Sakhno, I., Sakhno, S., Skrzypkowski, K., Isaienkov, O., Zagorski, K., and Zagorska, A. (2024). Floor Heave Control in Gob-Side Entry Retaining by Pillarless Coal Mining with Anti-Shear Pile Technology. Appl. Sci., 14.10.3390/app14124992 ↗
9. Zhang, Z., Shimada, H., Sasaoka, T., and Hamanaka, A. (2017). Stability Control of Retained Goaf-Side Gateroad under Different Roof Conditions in Deep Underground Y Type Longwall Mining. Sustainability, 9.10.3390/su9101671 ↗
10. Stability control of overburden and coal pillars in the gob-side entry under dynamic pressure10.1016/j.ijrmms.2023.105490 ↗
11. Li, L., Qian, D., Yang, X., and Jiao, H. (2022). Pressure Relief and Bolt Grouting Reinforcement and Width Optimization of Narrow Coal Pillar for Goaf-Side Entry Driving in Deep Thick Coal Seam: A Case Study. Minerals, 12.10.3390/min12101292 ↗
12. Qian, R., Feng, G., Guo, J., Wang, P., and Jiang, H. (2019). Effects of Water-Soaking Height on the Deformation and Failure of Coal in Uniaxial Compression. Appl. Sci., 9.10.3390/app9204370 ↗
13. Stress Distribution of Coal Pillar with Gob-Side Entry Driving in the Process of Excavation & Mining
14. Field and simulation study of the rational coal pillar width in extra-thick coal seams10.1002/ese3.538 ↗
15. Study on surrounding rock failure mechanism and rational coal pillar width of the gob-side coal roadway under influence of intense dynamic pressure10.1002/ese3.1416 ↗
16. The Coal Pillar Width Effect of Principal Stress Deflection and Plastic Zone Form of Surrounding Rock Roadway in Deep Excavation
17. A new frequency domain denoising method for coal mine transient electromagnetic measuring data10.1088/1361-6501/ad8671 ↗
18. Study of the response characteristics of the water–force coupling action of hard coal bodies in steeply inclined coal seams10.3389/feart.2022.1062738 ↗
19. Field and numerical investigation on the stability of coal pillars of gob-side entry driving with top coal10.1007/s12517-020-06234-5 ↗
20. Control of Gob-Side Roadway with Large Mining Height in Inclined Thick Coal Seam: A Case Study10.1155/2021/6687244 ↗
21. Wang, K., Huang, Y., Gao, H., Zhai, W., Qiao, Y., Li, J., Ouyang, S., and Li, W. (2020). Recovery Technology of Bottom Coal in the Gob-Side Entry of Thick Coal Seam Based on Floor Heave Induced by Narrow Coal Pillar. Energies, 13.10.3390/en13133368 ↗
22. Chang, Q., Ge, S., Shi, X., Sun, Y., Wang, H., Li, M., Wang, Y., and Wu, F. (2022). Determination of Narrow Coal Pillar Width and Roadway Surrounding Rock Support Technology in Gob Driving Roadway. Sustainability, 14.10.3390/su14084848 ↗
23. Study on the Instability Mechanism and Control Measures of a Roadway in a Mine with Retained Coal Pillars and Close Coal Seams10.1155/2021/8871807 ↗
24. Numerical simulation study on stability of narrow coal pillar of roadway driving along goaf
25. Study of influential factors on the stability of narrow coal pillar in gob-side entry driving and its engineering application
26. Determination of the narrow pillar width of gob-side entry driving
27. Rational width of narrow coal pillar based on the fracture line location of key rock B in main roof
28. Research on surrounding rock deformation characteristics of gob-side entry driving in deep inclined coal seam and its control technology
29. Research on evaluation and control technology of coal pillar stability based on the fracture digitization method10.1016/j.measurement.2020.107713 ↗
30. Analytical Models for the Strength of the Inclined as well as the Flat Coal Pillars using Rock Mass Failure Criterion10.1007/s00603-019-01788-7 ↗
31. Liu, X., Xu, H., Li, B., He, W., Liang, X., and Xia, H. (2023). Study on Surrounding Rock Failure Law of Gob-Side Entry Based on the Second Invariant of Deviatoric Stress. Sustainability, 15.10.3390/su151310569 ↗
32. Dynamic response and failure mechanism of fractured coal under different soaking times10.1016/j.tafmec.2018.09.001 ↗
33. Zhang, K., Wang, M., Yue, D., Huo, X., Yuan, Z., and Fan, Z. (2022, January 25–27). Experimental Study on Mechanical Characteristics and Acoustic Emission Characteristics of Coal with Different Saturation and Impact Tendency. Proceedings of the 2022 8th International Conference on Hydraulic and Civil Engineering: Deep Space Intelligent Development and Utilization Forum (ICHCE), Xi’an, China.10.1109/ICHCE57331.2022.10042528 ↗
34. The construction and application of a coupled parameter transfer system for fluid-mechanical model
35. Study of Study of mechanical properties and acoustic emission characteristics of coal measures under water- rock interaction
36. Criteria for Strength and Structural Failure of Rocks Based on Energy Dissipation and Energy Release Principles
37. Study on stability mechanism and control techniques of surrounding rock in gob-side entry retaining with flexible formwork concrete wall10.1007/s11771-023-5436-z ↗
38. Characteristics of waterproof failure and optimal width of narrow coal pillars under the coupled effects of mining, excavation and seepage10.1007/s40948-024-00825-2 ↗